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首页> 外文期刊>Energy >Performance comparison of two metallic eutectic solder based medium-temperature domestic thermal energy storage systems
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Performance comparison of two metallic eutectic solder based medium-temperature domestic thermal energy storage systems

机译：两种基于金属共晶焊料的中温家用热能存储系统的性能比较

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摘要

In this study, two thermal energy storage systems based on eutectic solder (Sn63/Pb37) metallic phase change material (PCM) are compared experimentally during their charging and discharging cycles. The first system is a single-PCM system composed of a packed bed of spherically encapsulated eutectic solder capsules. The other system is a two-PCM cascaded system comprising of eutectic solder spherical capsules at the top and erythritol spherical capsules at the bottom in a storage ratio of 50%:50%. The charging experiments are conducted with three different charging flow rates to investigate the effect of the flow rate. Charging experiments are also performed with three different set charging temperatures to investigate their effect. Discharging experiments are conducted with three different discharging flow rates to investigate their effect on the thermal performance. The cascaded storage system demonstrates better energy and exergy charging rates before the bottom PCM melts. After the low-temperature PCM at the bottom melts, the temperature at the bottom of the cascaded system increases, and the single-PCM system demonstrates higher charging energy and exergy rates. Higher discharging energy and exergy rates are obtained with the single-PCM system for longer periods during discharging compared to the cascaded system. The energy and exergy storage efficiencies of the cascaded system are generally higher compared to the single-PCM system. This is possibly because of the release of latent heat during discharging in a single cycle using multiple phase change sequences.
机译：在这项研究中，两个基于共晶焊料（Sn63 / Pb37）金属相变材料（PCM）的热能存储系统在充电和放电周期中进行了实验比较。第一个系统是一个单PCM系统，它由球形封装的共晶焊料胶囊的填充床组成。另一个系统是两级PCM级联系统，由顶部的共晶焊料球形胶囊和底部的赤藓醇球形胶囊组成，存储比例为50％：50％。以三种不同的充电流量进行充电实验，以研究流量的影响。还使用三种不同的设定充电温度进行充电实验，以研究其效果。用三种不同的排放流量进行排放实验，以研究它们对热性能的影响。级联存储系统在底部PCM熔化之前显示出更好的能量和火用充电率。底部的低温PCM熔化后，级联系统底部的温度升高，而单PCM系统显示出更高的充电能量和火用率。与级联系统相比，单PCM系统在放电过程中可获得更长的放电能量和更高的火用率。与单PCM系统相比，级联系统的能量和火用存储效率通常更高。这可能是由于在使用多个相变序列的单个循环中放电期间释放的潜热。

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